In constraints (REF ) and (REF ) of (\(P\) ) the terms \({U}\tilde{Z}_t\)  are bilinear, thus, (\(P\) ) is a mixed-integer nonlinear program (MINLP). We use the McCormick relaxation [1]} of these bilinear terms. The corresponding relaxation is a mixed integer linear program (MILP). Furthermore, since \(\tilde{Z}_t\)  are binary variables, this relaxation is tight [2]}.
